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Support for log-transforms (and other arithmetic) in formula?

See original GitHub issue

Hi all,

I’m a big fan of bambi, thanks for all your great work!

I have a question about more complicated formulas. I’m currently trying to fit models taken from a textbook. One of the formula strings used there is:

log(weight) ~ log(I(diam1 * diam2 * canopy_height)) + log(I(diam1 * diam2)) + log(I(diam1 / diam2)) + log(total_height) + group

In other words, it includes log transformations, and also some other arithmetic operations. What I’m curious about is whether bambi supports this in some way, or whether all such transformations should be done beforehand, e.g. by creating a variable log_total_height = np.log(total_height)?

Thanks for your help!

Issue Analytics

State:
Created 2 years ago
Comments:5

Top GitHub Comments

2reactions

aflaxmancommented, Feb 21, 2022

You can also perhaps save the annoyance of defining your own log by importing it explicitly instead with from numpy import log — very cool stuff!

1reaction

martiningramcommented, Feb 21, 2022

Terrific, thanks Tomas! This is working very well, so I am closing this issue!

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